go-mastodon/mastodon.go

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package mastodon
import (
"context"
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"encoding/json"
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"fmt"
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"net/http"
"net/url"
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"path"
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"strings"
)
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// Config is a setting for access mastodon APIs.
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type Config struct {
Server string
ClientID string
ClientSecret string
AccessToken string
}
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// Client is a API client for mastodon.
type Client struct {
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http.Client
config *Config
}
func httpDo(ctx context.Context, req *http.Request, f func(*http.Response, error) error) error {
tr := &http.Transport{}
client := &http.Client{Transport: tr}
c := make(chan error, 1)
go func() {
c <- f(client.Do(req))
}()
select {
case <-ctx.Done():
tr.CancelRequest(req)
<-c
return ctx.Err()
case err := <-c:
return err
}
}
func (c *Client) doAPI(ctx context.Context, method string, uri string, params url.Values, res interface{}) error {
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u, err := url.Parse(c.config.Server)
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if err != nil {
return err
}
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u.Path = path.Join(u.Path, uri)
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req, err := http.NewRequest(method, u.String(), strings.NewReader(params.Encode()))
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if err != nil {
return err
}
req.Header.Set("Authorization", "Bearer "+c.config.AccessToken)
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if params != nil {
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
}
return httpDo(ctx, req, func(resp *http.Response, err error) error {
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("bad request: %v", resp.Status)
} else if res == nil {
return nil
}
return json.NewDecoder(resp.Body).Decode(&res)
})
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}
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// NewClient return new mastodon API client.
func NewClient(config *Config) *Client {
return &Client{
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Client: *http.DefaultClient,
config: config,
}
}
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// Authenticate get access-token to the API.
func (c *Client) Authenticate(ctx context.Context, username, password string) error {
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params := url.Values{}
params.Set("client_id", c.config.ClientID)
params.Set("client_secret", c.config.ClientSecret)
params.Set("grant_type", "password")
params.Set("username", username)
params.Set("password", password)
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params.Set("scope", "read write follow")
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u, err := url.Parse(c.config.Server)
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if err != nil {
return err
}
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u.Path = path.Join(u.Path, "/oauth/token")
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req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(params.Encode()))
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if err != nil {
return err
}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("bad authorization: %v", resp.Status)
}
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res := struct {
AccessToken string `json:"access_token"`
}{}
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err = json.NewDecoder(resp.Body).Decode(&res)
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if err != nil {
return err
}
c.config.AccessToken = res.AccessToken
return nil
}
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// Toot is struct to post status.
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type Toot struct {
Status string `json:"status"`
InReplyToID int64 `json:"in_reply_to_id"`
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MediaIDs []int64 `json:"media_ids"`
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Sensitive bool `json:"sensitive"`
SpoilerText string `json:"spoiler_text"`
Visibility string `json:"visibility"`
}
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// Mention hold information for mention.
type Mention struct {
URL string `json:"url"`
Username string `json:"username"`
Acct string `json:"acct"`
ID int64 `json:"id"`
}
// Tag hold information for tag.
type Tag struct {
Name string `json:"name"`
URL string `json:"url"`
}
// Attachment hold information for attachment.
type Attachment struct {
ID int64 `json:"id"`
Type string `json:"type"`
URL string `json:"url"`
RemoteURL string `json:"remote_url"`
PreviewURL string `json:"preview_url"`
TextURL string `json:"text_url"`
}
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// Results hold information for search result.
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type Results struct {
Accounts []*Account `json:"accounts"`
Statuses []*Status `json:"statuses"`
Hashtags []string `json:"hashtags"`
}